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Lettuce is a cool weather plant, so it is only good in the spring and late fall, or early winter if you have a good hothouse or other shelter to keep away the cold. Pick it before the weather gets hot.
I don't generally know when that is. I just harvest as needed, but take a taste before harvesting. Once it starts to taste bitter, the season is over.
The term is bolting...this means that the lettuce plant begins to send up a flower stalk from the center of the rosette of leaves. You will notice this difference in the center about the same time as the lettuce begins to have a white sap when you break off or cut the leaves.
There are several varieties of lettuce that are slow to bolt in heat.
Any chance you know what varieties those are??? I will have to look at the package to know what I have.....just know that one was red & one was green! They are sprouting now, I am so excited. Got onions popping too and one potato, wonder if I didn't get him deep enough.....